/* ============================================
   PDF Toolkit — Minimal Dark
   Black · Olive · White
   ============================================ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --olive:        #a8ff00; /* matching image lime */
  --olive-light:  #c2ff33;
  --olive-dim:    #538000;
  --olive-muted:  rgba(168, 255, 0, 0.15);

  --bg:     #121212;
  --card:   #1a1a1a;
  --border: #2a2a2a;
  --hover:  #222222;

  --white:  #f0f0f0;
  --muted:  rgba(240, 240, 240, 0.5);
  --faint:  rgba(240, 240, 240, 0.18);

  --danger:  #ff4d4d;
  --success: #a8ff00;

  --r:  8px;
  --rL: 12px;
  --t:  0.15s ease;
  --h:  60px;
  --font: 'Inter', system-ui, sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--white);
  line-height: 1.55;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

/* ── SCROLLBAR ────────────────────────────── */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--olive); }
::selection { background: rgba(164,242,5,0.35); color: #000; }

/* ============================================
   HEADER
   ============================================ */
.site-header {
  position: sticky; top: 0; z-index: 100;
  height: var(--h);
  background: rgba(13,13,13,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex; align-items: center;
  gap: 24px; height: 100%;
}

.logo {
  display: flex; align-items: center;
  gap: 8px; text-decoration: none; flex-shrink: 0;
}

.logo-icon { display: flex; }

.logo-text {
  font-size: 1rem; font-weight: 700;
  color: var(--white); letter-spacing: -0.01em;
}

.logo-accent { color: var(--olive-light); }

.main-nav {
  display: flex; align-items: center;
  gap: 0; flex: 1;
}

.nav-link {
  display: inline-flex; align-items: center;
  padding: 6px 12px;
  border-radius: 6px;
  text-decoration: none;
  font-size: 0.82rem; font-weight: 500;
  color: var(--muted);
  transition: color var(--t), background var(--t);
  white-space: nowrap;
}

.nav-link:hover { color: var(--white); background: var(--hover); }
.nav-link.active { color: var(--olive-light); }
.nav-link:focus-visible { outline: 1px solid var(--olive); outline-offset: 2px; }

.header-right { display: flex; align-items: center; gap: 12px; margin-left: auto; }

.privacy-badge {
  font-size: 0.72rem; font-weight: 500;
  color: var(--olive-light);
  white-space: nowrap; letter-spacing: 0.01em;
}

.hamburger {
  display: none; flex-direction: column; gap: 4px;
  background: none; border: none; cursor: pointer;
  padding: 8px; border-radius: 6px;
}

.hamburger span {
  display: block; width: 18px; height: 1.5px;
  background: var(--white); border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}

.hamburger.open span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

.mobile-nav-overlay {
  display: none; position: fixed;
  top: var(--h); left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.6); z-index: 99;
}

.mobile-nav-overlay.open { display: block; }

.mobile-nav { background: var(--card); border-bottom: 1px solid var(--border); }

.mobile-nav-link {
  display: block; padding: 14px 24px;
  text-decoration: none; font-size: 0.9rem; font-weight: 500;
  color: var(--muted); border-bottom: 1px solid var(--border);
  transition: color var(--t);
}

.mobile-nav-link:hover { color: var(--white); }
.mobile-nav-link:last-child { border-bottom: none; }

/* ============================================
   PAGES
   ============================================ */
.page { display: none; }
.page.active { display: block; animation: fadeUp 0.2s ease; }

/* ============================================
   HERO — minimal
   ============================================ */
.hero {
  padding: 72px 0 64px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.hero-badge {
  display: inline-block;
  font-size: 0.72rem; font-weight: 600;
  color: var(--olive-light);
  letter-spacing: 0.08em; text-transform: uppercase;
  margin-bottom: 20px;
}

.hero-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700; letter-spacing: -0.03em;
  line-height: 1.15; margin-bottom: 16px;
  color: var(--white);
}

.gradient-text {
  color: var(--olive-light);
  background: none;
  -webkit-text-fill-color: unset;
}

.hero-subtitle {
  font-size: 0.95rem; color: var(--muted);
  max-width: 500px; margin: 0 auto 32px;
  line-height: 1.7;
}

.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex; align-items: center;
  justify-content: center; gap: 6px;
  padding: 8px 18px;
  border-radius: var(--r);
  border: 1px solid transparent;
  font-size: 0.85rem; font-weight: 500;
  font-family: var(--font); cursor: pointer;
  text-decoration: none;
  transition: all var(--t);
  white-space: nowrap; user-select: none;
}

.btn:focus-visible { outline: 1px solid var(--olive); outline-offset: 2px; }

.btn-primary {
  background: var(--olive);
  color: #000;
  border-color: var(--olive);
  font-weight: 600;
}

.btn-primary:hover:not(:disabled) {
  background: var(--olive-light);
  border-color: var(--olive-light);
}

.btn-ghost {
  background: transparent;
  color: var(--muted);
  border-color: var(--border);
}

.btn-ghost:hover { color: var(--white); border-color: #333; background: var(--hover); }

.btn-outline {
  background: transparent;
  color: var(--muted);
  border-color: var(--border);
}

.btn-outline:hover:not(:disabled) {
  color: var(--white);
  border-color: #333;
  background: var(--hover);
}

.btn-lg { padding: 10px 22px; font-size: 0.9rem; }
.btn-sm { padding: 5px 12px; font-size: 0.78rem; border-radius: 6px; }

.btn:disabled { opacity: 0.35; cursor: not-allowed; }

/* ============================================
   SECTIONS
   ============================================ */
.section { padding: 56px 0; }

.section-title {
  font-size: 1.5rem; font-weight: 700;
  text-align: center; letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.section-subtitle {
  font-size: 0.88rem; color: var(--muted);
  text-align: center; max-width: 520px;
  margin: 0 auto 40px; line-height: 1.7;
}

/* ============================================
   TOOL CARDS
   ============================================ */
.tool-cards-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
}

.tool-card {
  flex: 1 1 280px;
  max-width: 320px;
  background: linear-gradient(145deg, var(--card), #161616);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px 24px;
  display: flex; flex-direction: column;
  align-items: flex-start; gap: 12px;
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.tool-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--olive-light), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.tool-card:hover { 
  transform: translateY(-5px);
  border-color: rgba(168, 255, 0, 0.3);
  box-shadow: 0 12px 24px rgba(0,0,0,0.4), 0 0 20px rgba(168, 255, 0, 0.05);
}

.tool-card:hover::before {
  opacity: 1;
}

.tool-card-icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  background: rgba(168, 255, 0, 0.08);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 4px;
  transition: transform 0.3s ease, background 0.3s ease;
}

.tool-card:hover .tool-card-icon {
  transform: scale(1.1) rotate(-3deg);
  background: rgba(168, 255, 0, 0.15);
}

.tool-card-icon--splitter { color: var(--olive-light); }
.tool-card-icon--tojpg    { color: var(--olive-light); }
.tool-card-icon--topdf    { color: var(--olive-light); }
.tool-card-icon--combiner { color: var(--olive-light); }
.tool-card-icon--compressor { color: var(--olive-light); }

.tool-card-title { font-size: 0.9rem; font-weight: 600; color: var(--white); }

.tool-card-desc {
  font-size: 0.8rem; color: var(--muted);
  line-height: 1.6; flex: 1;
}

.tool-card-btn { align-self: stretch; justify-content: center; margin-top: 4px; }

/* ============================================
   PRIVACY SECTION
   ============================================ */
.privacy-section {
  padding: 56px 0;
  border-top: 1px solid var(--border);
}

.privacy-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--rL);
  overflow: hidden;
  margin-top: 36px;
}

.privacy-feature {
  background: var(--card);
  padding: 28px 24px;
  text-align: center;
  transition: background var(--t);
}

.privacy-feature:hover { background: var(--hover); }

.privacy-feature-icon { font-size: 1.5rem; margin-bottom: 12px; }

.privacy-feature h3 { font-size: 0.9rem; font-weight: 600; margin-bottom: 6px; }

.privacy-feature p { font-size: 0.8rem; color: var(--muted); line-height: 1.6; }

/* ============================================
   TOOL PAGES
   ============================================ */
.tool-page { padding: 36px 0 72px; }

.tool-header {
  display: flex; align-items: center;
  gap: 16px; margin-bottom: 28px;
  flex-wrap: wrap;
}

.tool-header > div { flex: 1; min-width: 180px; }

.tool-title {
  font-size: 1.3rem; font-weight: 700;
  letter-spacing: -0.02em; margin-bottom: 4px;
}

.tool-subtitle { font-size: 0.82rem; color: var(--muted); }

.back-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 14px; border-radius: var(--r);
  border: 1px solid var(--border); background: transparent;
  color: var(--muted); font-size: 0.82rem; font-weight: 500;
  font-family: var(--font); cursor: pointer;
  transition: color var(--t), border-color var(--t), background var(--t);
  white-space: nowrap; flex-shrink: 0;
}

.back-btn:hover { color: var(--white); border-color: #333; background: var(--hover); }
.back-btn:focus-visible { outline: 1px solid var(--olive); outline-offset: 2px; }

.privacy-notice {
  font-size: 0.78rem; color: var(--olive-light);
  margin-bottom: 24px; font-weight: 500;
}

/* ============================================
   UPLOAD AREA
   ============================================ */
.upload-area {
  border: 1px dashed var(--border);
  border-radius: var(--rL);
  padding: 48px 24px;
  text-align: center; cursor: pointer;
  transition: border-color var(--t), background var(--t);
  background: var(--card); margin-bottom: 16px;
}

.upload-area:hover,
.upload-area:focus-visible { border-color: var(--olive); }
.upload-area.drag-over { border-color: var(--olive-light); background: var(--hover); }
.upload-area:focus-visible { outline: 1px solid var(--olive); outline-offset: 2px; }

.upload-icon { margin-bottom: 12px; color: var(--muted); }
.upload-area:hover .upload-icon { color: var(--olive-light); }
.upload-area.drag-over .upload-icon { color: var(--olive-light); }

.upload-title { font-size: 0.9rem; font-weight: 600; margin-bottom: 4px; }
.upload-subtitle { font-size: 0.78rem; color: var(--muted); }

/* ============================================
   FILE INFO CARD
   ============================================ */
.file-info-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 12px 16px; margin-bottom: 20px;
}

.file-info-inner { display: flex; align-items: center; gap: 12px; }
.file-info-icon { font-size: 1.4rem; flex-shrink: 0; }

.file-info-details {
  flex: 1; min-width: 0;
  display: flex; flex-direction: column; gap: 1px;
}

.file-name {
  font-size: 0.85rem; font-weight: 600;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

.file-meta { font-size: 0.75rem; color: var(--muted); }

.remove-file-btn {
  background: none; border: none; cursor: pointer;
  color: var(--faint); padding: 4px 6px; border-radius: 4px;
  font-size: 0.85rem;
  transition: color var(--t), background var(--t);
  flex-shrink: 0;
}

.remove-file-btn:hover { color: var(--danger); background: rgba(201,92,92,0.1); }

/* ============================================
   ERROR
   ============================================ */
.error-message {
  font-size: 0.82rem; color: #d97474;
  border-left: 2px solid var(--danger);
  padding: 10px 14px; margin-bottom: 16px;
  background: rgba(201,92,92,0.06);
  border-radius: 0 var(--r) var(--r) 0;
}

/* ============================================
   PAGES HEADER & GRID
   ============================================ */
.pages-header {
  display: flex; align-items: center;
  gap: 10px; margin-bottom: 14px; flex-wrap: wrap;
}

.pages-title { font-size: 0.85rem; font-weight: 600; color: var(--muted); flex: 1; }
.pages-actions { display: flex; gap: 6px; }

.page-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
  gap: 8px; margin-bottom: 20px;
}

.page-grid--small {
  grid-template-columns: repeat(auto-fill, minmax(72px, 1fr));
  gap: 6px;
}

.page-thumb {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px; overflow: hidden;
  cursor: pointer;
  transition: border-color 0.15s;
  position: relative;
}

.page-thumb:hover { border-color: var(--olive); }

.page-thumb.selected {
  border-color: var(--olive-light);
  box-shadow: 0 0 0 2px rgba(107,138,58,0.25);
}

.page-thumb canvas { width: 100%; height: auto; display: block; }

.page-thumb-placeholder {
  width: 100%; aspect-ratio: 210/297;
  background: var(--hover);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem;
}

.page-num {
  text-align: center; font-size: 0.65rem; font-weight: 500;
  padding: 3px; color: var(--muted); background: var(--card);
}

.page-thumb .check-badge {
  position: absolute; top: 3px; right: 3px;
  width: 16px; height: 16px;
  background: var(--olive-light); color: var(--bg);
  border-radius: 50%; font-size: 9px;
  display: none; align-items: center; justify-content: center;
  font-weight: 800;
}

.page-thumb.selected .check-badge { display: flex; }

/* ============================================
   OPTIONS / SETTINGS
   ============================================ */
.option-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 16px 20px; margin-bottom: 12px;
}

.option-label {
  display: block;
  font-size: 0.72rem; font-weight: 600;
  color: var(--muted); margin-bottom: 8px;
  letter-spacing: 0.06em; text-transform: uppercase;
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px; margin-bottom: 12px;
}

.settings-grid .option-card { margin-bottom: 0; }

.text-input {
  width: 100%; padding: 8px 12px;
  border: 1px solid var(--border); border-radius: 6px;
  font-size: 0.85rem; font-family: var(--font);
  color: var(--white); background: var(--bg);
  transition: border-color var(--t);
}

.text-input::placeholder { color: var(--faint); }
.text-input:focus { outline: none; border-color: var(--olive); }

.select-input {
  width: 100%; padding: 8px 12px;
  border: 1px solid var(--border); border-radius: 6px;
  font-size: 0.85rem; font-family: var(--font);
  color: var(--white); background: var(--bg);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%23556b2f' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 32px; cursor: pointer;
  transition: border-color var(--t);
}

.select-input option { background: #1a1a1a; }
.select-input:focus { outline: none; border-color: var(--olive); }

.range-input-row { display: flex; gap: 8px; align-items: center; }
.range-input-row .text-input { flex: 1; }

.input-hint { font-size: 0.72rem; color: var(--faint); margin-top: 5px; }
.hint-text { font-size: 0.78rem; color: var(--muted); margin-bottom: 12px; }

/* --- Radio Group --- */
.radio-group { display: flex; flex-direction: column; gap: 8px; }

.radio-label {
  display: flex; align-items: flex-start; gap: 10px;
  cursor: pointer; padding: 12px 14px;
  border-radius: var(--r); border: 1px solid var(--border);
  transition: border-color var(--t), background var(--t);
}

.radio-label:has(input:checked) {
  border-color: var(--olive);
  background: var(--olive-muted);
}

.radio-label:hover { border-color: #2d2d2d; background: var(--hover); }
.radio-label input[type="radio"] { display: none; }

.radio-custom {
  width: 15px; height: 15px;
  border: 1px solid var(--border); border-radius: 50%;
  flex-shrink: 0; margin-top: 3px;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.radio-label:has(input:checked) .radio-custom {
  border-color: var(--olive-light);
  box-shadow: inset 0 0 0 3px var(--bg), inset 0 0 0 5px var(--olive-light);
}

.radio-label strong { font-size: 0.85rem; font-weight: 600; }
.radio-desc { font-size: 0.78rem; color: var(--muted); margin-top: 2px; }

/* ============================================
   ACTION ROW
   ============================================ */
.action-row {
  display: flex; gap: 10px;
  justify-content: center;
  margin: 24px 0; flex-wrap: wrap;
}

/* ============================================
   PROGRESS
   ============================================ */
.progress-container {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--r); padding: 20px;
  margin-bottom: 16px; text-align: center;
}

.progress-label { font-size: 0.8rem; color: var(--muted); margin-bottom: 10px; }

.progress-bar-track {
  width: 100%; height: 3px;
  background: var(--border); border-radius: 2px; overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--olive-light);
  border-radius: 2px; width: 0%;
  transition: width 0.3s ease;
}

/* ============================================
   RESULT CARD
   ============================================ */
.result-card {
  background: var(--card);
  border: 1px solid var(--olive-dim);
  border-radius: var(--rL);
  padding: 28px; text-align: center; margin-bottom: 16px;
}

.result-icon { font-size: 1.8rem; margin-bottom: 10px; }
.result-text { font-size: 0.88rem; font-weight: 500; color: var(--muted); margin-bottom: 18px; }

/* ============================================
   IMAGE / PDF LISTS
   ============================================ */
.image-list, .pdf-list {
  display: flex; flex-direction: column;
  gap: 6px; margin-bottom: 20px;
}

.image-card, .pdf-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 10px 14px;
  display: flex; align-items: center; gap: 12px;
  transition: border-color var(--t);
  user-select: none;
}

.image-card:hover, .pdf-card:hover { border-color: #2d2d2d; }
.image-card.dragging, .pdf-card.dragging { opacity: 0.4; }
.image-card.drag-over-top,  .pdf-card.drag-over-top  { border-top: 2px solid var(--olive-light); }
.image-card.drag-over-bottom,.pdf-card.drag-over-bottom{ border-bottom: 2px solid var(--olive-light); }

.drag-handle {
  color: var(--faint); cursor: grab; padding: 2px;
  display: flex; align-items: center;
  flex-shrink: 0; transition: color var(--t);
}

.drag-handle:hover { color: var(--muted); }
.drag-handle:active { cursor: grabbing; }

.image-thumb {
  width: 40px; height: 40px; object-fit: cover;
  border-radius: 4px; flex-shrink: 0;
  border: 1px solid var(--border);
}

.pdf-icon { font-size: 1.4rem; flex-shrink: 0; }

.card-details { flex: 1; min-width: 0; }
.card-name { font-size: 0.82rem; font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.card-meta { font-size: 0.72rem; color: var(--muted); margin-top: 1px; }

.card-order {
  font-size: 0.68rem; font-weight: 600;
  color: var(--olive-light); min-width: 18px;
  text-align: center; flex-shrink: 0;
}

.card-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.card-action-btn,
.card-remove {
  background: none; border: none; cursor: pointer;
  color: var(--faint); padding: 4px 6px; border-radius: 4px;
  font-size: 0.85rem; font-weight: bold;
  transition: color var(--t), background var(--t);
  flex-shrink: 0; display: flex; align-items: center; justify-content: center;
}

.card-action-btn:hover { color: var(--white); background: rgba(255,255,255,0.08); }
.card-remove:hover { color: var(--danger); background: rgba(201,92,92,0.08); }

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  color: var(--faint);
}

.footer-inner {
  display: flex; align-items: center;
  justify-content: space-between; flex-wrap: wrap; gap: 12px;
}

.footer-logo .logo-text { font-size: 0.88rem; }
.footer-logo p { font-size: 0.72rem; margin-top: 2px; }
.footer-credits { text-align: right; }
.footer-privacy { font-size: 0.78rem; color: var(--olive-light); margin-bottom: 2px; }
.designer-credit { font-size: 0.72rem; color: var(--muted); }
.designer-credit a {
  color: var(--white);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--t);
}
.designer-credit a:hover {
  color: var(--olive-light);
}

/* ============================================
   TOAST
   ============================================ */
.toast {
  position: fixed; bottom: 20px; left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: #1e1e1e; border: 1px solid var(--border);
  color: var(--white);
  padding: 10px 20px; border-radius: var(--r);
  font-size: 0.82rem; font-weight: 500;
  box-shadow: 0 8px 24px rgba(0,0,0,0.5);
  transition: transform 0.3s ease, opacity 0.3s ease;
  opacity: 0; pointer-events: none; z-index: 9999;
  max-width: calc(100vw - 40px); text-align: center;
}

.toast.show { transform: translateX(-50%) translateY(0); opacity: 1; }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
  .main-nav { display: none; }
  .privacy-badge { display: none; }
  .hamburger { display: flex; }
  .hero { padding: 48px 0 40px; }
  .privacy-features { grid-template-columns: 1fr; }
  .tool-cards-grid { grid-template-columns: 1fr 1fr; }
  .settings-grid { grid-template-columns: 1fr 1fr; }
  .action-row .btn-lg { width: 100%; }
  .footer-inner { flex-direction: column; text-align: center; }
  .footer-credits { text-align: center; margin-top: 4px; }
  .upload-area { padding: 36px 16px; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero-title { font-size: 1.6rem; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .tool-cards-grid { grid-template-columns: 1fr; }
  .settings-grid { grid-template-columns: 1fr; }
  .range-input-row { flex-direction: column; }
  .tool-header { flex-direction: column; }
}

/* ============================================
   ANIMATION
   ============================================ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}